With TonyD's settings (except at 60Hz per the only option offered), it was locked at 60 fps comfortably over the sea, and went down to 20 or so low level over London - with slight stutters. I'll maybe try a RAM disk to see if that helps.
I'm getting the 'blue lines on the horizon' bug, and one or two other artefacts, but otherwise it seems fine.
I've got the default Catalyst 3d settings for now - I'm not sure if altering them will make any difference.
Thanks for the input, everyone.
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